UPDATE : I’ve just tested the exploit on Windows 2008 R2 SP1 x64, exploit works like a charm without any modification.

Hi again,

This time I worked on Kernel-Land a little. Microsoft Windows Kernel Intel x64 SYSRET Vulnerability (MS12-042) was only exploited by VUPEN, apparently!, But no PoC or exploit publicly available. So I decided to work on this challenge just for fun.At first glance, it was difficult to get Code-Execution but after several times struggling with Windbg I finally succeeded on triggering the bug and get code-execution.

By the way, Windbg had stupid bug on executing SWAPGS by single-stepping! I don’t really know why, but the guest VM always reboots!
I managed to get it to work with IDA Pro + GDB remote Debugging plugin after all!